Gong.



C. E. AVERY.

GONG.

' APPLICATION FILED AUG.5. 1914.

Patented Oct. 5, 1915.

2 SHEETS SHEET I.

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C. E. AVERY.

GONG.

APPLICATION FILED AUG.5. 1914.

1,155,869. Patel lted 001;. 5, 1915.

2 SHEETS-SHEET 2.

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CHARLES E. AVERY, 0F TRENTON, NEW JERSEY, ASSIGNOR TO THE MANHATTAN ELECTRICAL SUPPLY COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

GONG.

Specification of Letters Patent.

Patented Oct. 5, 1915.

To all whom it may concern:

Be it known that 1, CHARLES E. AVERY, a citizen of the United States of America, residing in Trenton, in the county of Mercer and State of New Jersey, have invented certain new and useful Improvements in Gongs, of which the following is a specification.

My invention relates to gongs, and particularly to gongs of the electromechanical type in which the hammer is mechanically actuated, for instance through spring-driven gearing, but controlled by an electrically operated escapeinent.

The principal object of my invention is to provlde an improved escapement mechanism for devices of this type, although certain other features of construction have also been improved as will be observed from the accompanyingdrawing, in which Figure l is a broken section through a gong device in which my invention is embodied in one form; Fig. 2 is a partial section showing the gong and escapement in another position; Fig. 3 is a partial'elevation showing the armature escapement; Fig. 4: is a similar view with thearmature'in another position; Fig. 5 is a-broken section showing the hammer shaft and connections; Fig. 6 is a diagram showing the travel of the escapement lever; n 1g.-.7 is a perspective of a casing with independent wiring box; Fig. 8 is a partial cross section therethrough; and Fig. 9 is a partial longitudinal section on the line 9-9 Fig. 8.

The gong 10 mounted on the casing 11 is struck by the hammer head 12 driven in well understood manner from a spring 13 through a train of gears 14 one of which meshes with the pinion 15 on the hammer shaft 16 which lies substantially at right angles to the axis of the gong. The head of the hammer is pivoted at 17 on its arm 18 and is normally held in position at right angles to the arm 18 by the leaf spring 19. As the hammer rotates, however, substantially in the plane of the axis of the gong, the striking end of the head is swung outward by centrifugal force into such position that it strikes the inner face of the lower edge of the gong 10. On its rebound, the centrifugal force being now nullified by its impact upon the gong, the head is pressed by spring 19 into normal position in which it clears the edge of the gong as the shaft 16 is further rotated.

The hammer is halted in the position shown in Fig. 1 by the stop lever 20 pivoted eccentric to the hammer shaft at 21 on the head 22 fast on the hammer shaft and bearing at its free end against the double detent 23. Adjacent its'pivoted end, the lever 20 passes through a guide 24 pivoted on bracket 25. Consequently as the head 22 rotates, the free end of lever 20 isoscillated through the curvilinear path indicated in Fig. 6. As the end of the lever travels upward on the path indicated bythe arrow X, it is retracted from and clears the detent 23, while on its descent in the path indicated by the arrow Y, it meets and is halted by the detent 23. The latter is pivoted at 23 and rigidly connectedto the armature A of the electro-magnet 26. At its stop-lever- .engaging end, it is forked and provided with the stepped shoulders a and 7) against which the end of the stop lever successively rests. Thus, as the lever descends on its path Y, it is halted by the shoulder a. Upon the energization of the electromagnet 26 the detent lever is rocked in the direction of the arrow S (Fig. .3), thus moving the shouldera from beneath the stoplever and permitting the same to drop upon the shoulder 2). If the circuit through the magnet 26 be now broken, the retracting spring 27 rocks the detent lever back to position, thus permitting the stop lever to escape and simultaneously restoring. the shoulder a to the positionin which it is engaged by the stop lever, after the gong has been struck.

The circuit may be normally either open or closed and one blow will be struck on the gong for each make and break of the circuit. The gong may be made to ring continuously however, on either open or closed circuit, by omitting one of the shoulders at or b, the stop lever being arrested by the remaining shoulder when the armature is restored to normal position.

It will be obvious that the force of the blow of the stop lever against the detent is relatively slight, by reason not only of the fact that its travel has been halted through the impact of the hammer against the gong just preceding the engagement of the detent by the stop but also by reason of the fact that at the moment at which the impact occurs, the axis 21 of the stop lever and the axis of the pivoted guide 24 through which it slides are almost alined so that the pressure exerted by the driving spring 13 through the shaft 16 is very slight. This is particularly advantageous since the friction resulting from the engagement of the stop and detent levers is thereby minimized and the escapement can be operated on a much lower current than it is usually necessary to employ. Further, it will be noted that at the moment at which the gong is struck by the hammer the stop lever has reached the upper extent of its travel and is just about to descend in the path of the arrow Y. Conse quently its speed at the moment of gong impact by the hammer is practically m'l and there is no such strain upon the bearings as would result if it were suddenly halted during rapid travel.

A further feature of my invention although this feature is not claimed in the present application is found in the independent wiring box 28 shown in Figs. 7, 8 and 9. This construction presents an ad vantage over that of Fig. l in that the conduits 29 may be fastened into the box 28 and the wiring to the terminal plates 30, 31 therein completed before the gong casing is installed. This not only facilitates the installation but also preserves the gong casing from possible disfigurement. The wiring box 28 is preferably left open on the top and one side which fit against and are closed by the walls of the gong mechanism casing, which is undercut on one side to receive the wiring box. A door 32 in one side of the latter permits access to the interior of the box after the gong casing has been adjusted in position, and through which the wires 33 leading to and from the electromagnet may be fastened to the binding screws on the terminal plates 30 and 31.

Modifications of the details of construction embodying my invention will readily occur to those skilled in the art and I do not limit my invention to the precise construction shown and described.

I claim as my invention:

1. In a gong striker, a'rotatable hammer shaft, a stop lever pivotally connected to an eccentric on said shaft and a detent engaging said stop lever to arrest and release said hammer shaft.

2. In a gong striker, a rotatable hammer shaft, an oscillating stop lever operatively connected to said shaft, a detent engaging Copies of this patent may be obtained for five cents said step lever to arrest and release the hammer shaft and means for shifting said stop lever to clear said detent on the oscillation of said lever in one direction.

3. In a gong striker, a rotatable hammer shaft, a stop lever operatively connected to said shaft and oscillated thereby in a plane, a detent engaging said stop lever to arrest and release the hammer shaft and means for retracting the stop lever in said plane to clear said detent on the oscillation of said lever in one direction.

4. In a gong striker, a rotatable hammer shaft, a gong hammer operated thereby, an oscillating stop lever, and an operative con nection between the said lever and hammer shaft for oscillating said lever, the movement of the latter being so timed that it is substantially halted near one end of its oscillating travel at the moment of gong impact by the hammer.

5. In a gong striker, a rotatable hammer shaft, a stop lever eccentrically pivoted thereto, a pivoted guide for said lever, and a detent engaged by said stop lever at the moment at which the axis of said guide and the pivoting axis of said lever approach alinement.

6. In a gong striker, a rotatable hammer shaft, an oscillating stop lever operatively connected to said shaft, a detent engaging said stop lever to arrest and release the hammer shaft and means for shifting said stop lever in its plane of oscillation to clear said detent on the oscillation of said lever in one direction.

7. In a gong striker, a rotatable hammer shaft, a stop lever mounted on said shaft but eccentrically thereto, a guide sleeve pivoted on a fixed axis out of alinement with the hammer shaft through which sleeve said stop lever passes whereby an oscillatory movement is imparted to said lever on the rota tion of the shaft, together with. a detent engaged by said stop lever on its oscillation in one direction, for the purpose specified.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

CHARLES E. AVERY.

Witnesses:

L. H. Gno'rn, M. E. KEIR.

each, by addressing the Gommissioner of Patents,

Washington, D. G. 

